采用不同方法加固框架结构抗震性能分析

发布时间：2018-06-22 17:37

本文选题：结构加固 + 槽型钢支撑　；参考：《兰州交通大学》2017年硕士论文

【摘要】：伴随着经济的发展和城镇化建设的全面开展,社会对学校、医院、住宅、商场、写字楼等公共设施建设日渐增多,当今新建建筑不能满足人们的需求之外,需要对大量既有建筑进行改造和加固,以便可以满足现在人们的需求和发挥其在社会中的实际价值。建筑加固这一行业在近年来发展迅速,并且可以通过较少的投入获得较高的回报,由于地震作为对建筑危害最大的影响因素,对已有建筑加固后结构的抗震性能分析需要引起重视。本文使用的工程实例为四层钢筋混凝土框架结构,通过检测和鉴定,原结构的层间位移角有超限情况,柱子的轴压比不满足要求,部分的梁有锈蚀现象,采用不同的加固方法改善原结构存在的问题,主要完成了以下工作:⑴查阅了相关的中外资料和文献,了解到目前国内外有关结构加固的发展现状。通过对比国内外结构加固发展的情况,既有建筑结构加固在当今时代的重要性和必要性。⑵介绍了目前国内常用到的一些加固方法,分析了不同加固方法的特点,对结构的抗震理论进行了说明,论述了部分加固方法的计算理论。⑶对工程结构的基本概况进行了介绍,用PKPM软件建模计算出了原结构超限的层间位移、位移角和柱子轴压比不满足要求,得出了原结构的自振周期和层间位移和层间位移角等。⑷对钢筋混凝土框架结构分析之后,选择合理的加固方案对其进行加固。对超限的层间位移角选用槽型钢X支撑,可以有效的改善位移角超限情况,部分梁选用碳纤维包裹,柱子选用了两种加固方案—增大截面法和外包钢加固法,对加固后的结构进行了模态分析。⑸选取了三条不同的地震波,分析结构加固后多遇地震作用下动力响应分析,然后对比分析柱两种加固结果,同样用三条地震波在罕遇地震下对结构进行弹塑性分析。⑹介绍了本文选用四层框架结构加固效果和加固后结构的抗震性能,指出存在的一些不足之处和需要改进的地方。
[Abstract]:With the development of economy and the development of urbanization, the construction of public facilities such as schools, hospitals, houses, shopping malls and office buildings is increasing day by day. A large number of existing buildings need to be renovated and reinforced so that they can meet the needs of people and give play to their practical value in society. The industry of building reinforcement has developed rapidly in recent years and can be rewarded with less investment, since earthquakes are the most harmful factors to buildings. Attention should be paid to the seismic performance analysis of existing reinforced structures. The engineering example used in this paper is a four-story reinforced concrete frame structure. The detection and identification show that the interstory displacement angle of the original structure exceeds the limit, the axial compression ratio of the column does not meet the requirements, and part of the beam is corroded. Using different reinforcement methods to improve the existing problems of the original structure, mainly completed the following work: 1 to consult the relevant domestic and foreign materials and literature, to understand the current situation of the development of the structure reinforcement at home and abroad. By comparing the development of structural strengthening at home and abroad, the importance and necessity of strengthening existing building structures in the present age are introduced. Some reinforcement methods commonly used in China are introduced, and the characteristics of different reinforcement methods are analyzed. The aseismic theory of the structure is explained, and the calculation theory of partial reinforcement method is discussed. The basic situation of the engineering structure is introduced, and the interstory displacement of the original structure is calculated by using PKPM software. The displacement angle and the axial compression ratio of the columns are not satisfied with the requirements. After the analysis of the original structure's natural vibration period and the interstory displacement angle of the reinforced concrete frame structure, a reasonable reinforcement scheme is selected to reinforce the reinforced concrete frame structure. The cross section X support can be used to improve the displacement angle. Some beams are wrapped with carbon fiber, and the columns are strengthened by increasing section method and steel reinforcement method. Modal analysis of the strengthened structure is carried out. 5. Three different seismic waves are selected to analyze the dynamic response of the strengthened structure under frequent earthquake, and then the results of two kinds of columns are compared and analyzed. At the same time, using three seismic waves to analyze the structure under rare earthquake, the paper introduces the strengthening effect of the four-story frame structure and the seismic performance of the strengthened structure, and points out some shortcomings and the improvement points out.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11;TU375.4

【参考文献】